SMC Networks 7904BRA FICHE, Manual

Page: 120 / 129

E
THERNET
C
ABLE
B-3
Pin Assignments
With 100BASE-TX/10BASE-T cable, pins 1 and 2 are used for
transmitting data, and pins 3 and 6 for receiving data.
Straight-Through Wiring
If the port on the attached device has internal crossover wiring (MDI-X),
then use straight-through cable.
Crossover Wiring
If the port on the attached device has straight-through wiring (MDI), use
crossover cable.
RJ-45 Pin Assignments
Pin Number
Assignment
1
1 Tx+
2 Tx-
3 Rx+
6 Rx-
1: The “+” and “-” signs represent the polarity of the wires
that make up each wire pair.
Straight-Through Cable Pin Assignments
End 1 End 2
1 (Tx+) 1 (Tx+)
2 (Tx-) 2 (Tx-)
3 (Rx+) 3 (Rx+)
6 (Rx-) 6 (Rx-)
Crossover Cable Pin Assignments
End 1 End 2
1 (Tx+) 3 (Rx+)
2 (Tx-) 6 (Rx-)
3 (Rx+) 1 (Tx+)
6 (Rx-) 2 (Tx-)